共查询到20条相似文献，搜索用时 703 毫秒
1.
本试验测定了马传贫弱毒疫苗免疫马与传贫病马琼脂扩散沉淀抗体(沉淀抗体)及补体结合反应抗体(补反抗体)活性的耐热曲线。证明免疫马的抗体较传贫病马的耐热性差。64℃水浴15分钟后,免疫马血清沉淀抗体完全丧失反应活性,而传贫病马血清一般多能保持阳性反应。用65℃水浴15分钟处理琼扩阳性反应血清,结果传贫病马血清142份中的128份仍为琼扩阳性,传贫病马注苗后的血清5份均呈琼扩阳性;免疫马血清37份则全部转为阴性反应。65℃水浴15分钟后,免疫马血清补反抗体完全丧失反应活性,而传贫病马血清仍可呈阳性反应。用65℃水浴15分钟处理补反阳性血清,结果传贫病马血清40份、强毒接种马血清2份的补反仍保持阳性;免疫马血清42份则均转为阴性。 相似文献
2.
3.
随着免疫化学诊断药盒在临床医学上的广泛应用,其药盒中重要试剂之一——第二抗体的需求量不断增加。近年来,多用马和驴等大动物为免疫动物,以限量多次采血法生产大量第二抗体血清。我们在研制出口用马抗羊血清过程中,观察到马抗羊血清与传贫琼扩抗原之间可发生非特异性反应。通过试验,明确了该反应是由传贫琼扩抗原中被浓缩的牛血清同马抗羊血清抗体之间交叉所致的,现报道如下。 相似文献
4.
通过对补反、琼扩双阳性及补反或琼扩单阳性的79份免疫马血清和52份自然感染马血清的ELISA终点滴度测定,确定了被检血清适宜稀释倍数。还证明采用多头份健康马混合血清作为不同地区被检血清的阴性对照是适宜的. 对1.625份不同地区的马血清的检测,进一步证明本法是特异性的,具有可重复性。用ELISA检测30份国际参照血清,所获结果与琼扩试验完全一致。 相似文献
5.
应用马传贫驴白细胞弱毒株系特异单克隆抗体酶结合物的免疫斑点试验检测证明，自28份马传贫弱毒疫苗免疫马血清中均检出与单抗呈阳性反应的相应抗原，持续期达51个月以上，自19份人工感染传贫马、自然感染传贫马、弱毒疫苗免疫后攻毒马及42份健康马血清中均未检出单抗原，病理学检查表明，弱毒疫苗免疫马无马传贫病理学改变，以弱毒免疫马肝、脾、骨髓材料进行生物学试验表明，弱毒免疫马体内不存在致病性病毒，这阐明该弱毒疫苗的免疫本质提出一个非常值得今后深入加以探讨的课题。 相似文献
6.
本研究通过基因工程技术生产了受滋病毒的Ｐ２４抗原，并且运用于马传贫病毒的血清学检查，与传统方法所制备的马传贫抗原对照检测军马２５２４匹以及本实验室保留的各种马传贫阳性血清２２４份。结果显示马传贫血清能够免疫沉淀爱滋病毒（ＨＩＶ）的Ｐ２４，表明它们之间有着共同的抗原决定簇，且Ｐ２４检测法检测率高，检测周期仅３￣４ｈ，明显优于传统法，可用于马传贫的快速检测。 相似文献
7.
8.
通过对补反、琼扩双阳性及补反或琼扩单汨性的79份免疫马血清和52份自然感染马血清的ELJSA终点滴度测定,确定了被检血清适宜稀释倍数。还证明采用多头份健康马混合血清作为不同地区被检血清的阴性对照是适宜的。对1.625份不同地区的马血清的检测。进一步证明本法的特异性的, 用ELISA检测30份国际参照血清,所获结果与琼扩试验完全一致。 相似文献
9.
本文报道了用水牛血清培养驴胎继代细胞生产马传贫琼扩抗原的试验研究。驴胎继代细胞在含10～25％水牛血清的培养液中生长良好,培养2～3天形成单层。单层细胞接种马传贫病毒,换入含5～20％水牛血清的维持液,培养12天收获,生产出沉淀扩散环14～18mm的马传贫琼扩抗原,从而证明水牛血清可代替黄牛血清用于细胞培养和生物制品生产。 相似文献
10.
马传贫驴白细胞弱毒疫苗株跨膜蛋白主要免疫决定区基因的克隆与表达 总被引：3，自引：0，他引：3
从感染驴白细胞的马传贫驴白细胞弱毒疫苗株前病毒DNA中克隆了编码跨膜蛋白主要免疫决定区(TMIR)的基因，并在大肠杆菌中进行了表达。所表达的融合蛋白有一部分是可溶的，其氨基端带有6个组氨酸的标签，因此可以用固定化金属离子亲和层析法在非变性条件下进行纯化。在间接酶联免疫吸附试验(ELISA)和免疫印迹试验中，重组的TMIR蛋白可与马传贫阳性血清样品发生反应，而与健康马血清无任何反应。这表明该重组蛋白具有良好的抗原性和特异性，可用于马传贫弱毒疫苗株在体内外复制、接种马体内免疫应答及马传贫诊断的研究。 相似文献
11.
12.
13.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
16.
以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
17.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
18.
19.
20.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献